function sAlert(str){ 
	//document.write('<iframe   style="position:absolute;z-index:9;width:expression(this.nextSibling.offsetWidth);height:expression(this.nextSibling.offsetHeight);top:expression(this.nextSibling.offsetTop);left:expression(this.nextSibling.offsetLeft);" frameborder="0" ></iframe>');
   var msgw,msgh,bordercolor; 
   msgw=800;//提示窗口的宽度 
   msgh=500;//提示窗口的高度 
   titleheight=25 //提示窗口标题高度 
   bordercolor="#6194D6";//提示窗口的边框颜色 
   titlecolor="#6194D6";//提示窗口的标题颜色 

   var sWidth,sHeight; 
   sWidth=document.body.offsetWidth; 
   sHeight=screen.height; 
   var bgObj=document.createElement("div"); 
   bgObj.setAttribute('id','bgDiv'); 
   bgObj.style.position="absolute"; 
   bgObj.style.top="0"; 
   bgObj.style.background="#cccccc"; 
   bgObj.style.filter="progid:DXImageTransform.Microsoft.Alpha(style=3,opacity=25,finishOpacity=70"; 
   bgObj.style.opacity="0.6"; 
   bgObj.style.left="0"; 
   bgObj.style.width=sWidth + "px"; 
   bgObj.style.height=sHeight + "px"; 
   bgObj.style.zIndex = "10000"; 
   document.body.appendChild(bgObj); 

	var msgf=document.createElement("iframe") 
   msgf.setAttribute("id","msgDivf"); 
   msgf.setAttribute("align","center"); 
   msgf.style.background="white"; 
   msgf.style.border="1px solid " + bordercolor; 
      		msgf.style.position = "absolute"; 
            msgf.style.left = "50%"; 
           	msgf.style.top = "50%"; 
            msgf.style.font="12px/1.6em Verdana, Geneva, Arial, Helvetica, sans-serif"; 
			//绝对居中的方法
            msgf.style.marginLeft = -msgw/2+"px" ; 
            msgf.style.marginTop = -msgh/2+"px"; 
            msgf.style.width = msgw + "px"; 
            msgf.style.height =msgh + "px"; 
            msgf.style.textAlign = "center"; 
            msgf.style.lineHeight ="25px"; 
            msgf.style.zIndex = "9"; 
			
	
   var msgObj=document.createElement("div") 
   msgObj.setAttribute("id","msgDiv"); 
   msgObj.setAttribute("align","center"); 
   msgObj.style.background="white"; 
   msgObj.style.border="1px solid " + bordercolor; 
      		msgObj.style.position = "absolute"; 
            msgObj.style.left = "50%"; 
           	msgObj.style.top = "50%"; 
            msgObj.style.font="12px/1.6em Verdana, Geneva, Arial, Helvetica, sans-serif"; 
			//绝对居中的方法
            msgObj.style.marginLeft = -msgw/2+"px" ; 
            msgObj.style.marginTop = -msgh/2-20+"px"; 
            msgObj.style.width = msgw + "px"; 
            msgObj.style.height =msgh + "px"; 
            msgObj.style.textAlign = "center"; 
            msgObj.style.lineHeight ="25px"; 
            msgObj.style.zIndex = "10001"; 
    
     var title=document.createElement("h4"); 
     title.setAttribute("id","msgTitle"); 
     title.setAttribute("align","right"); 
     title.style.margin="0"; 
     title.style.padding="3px"; 
     title.style.background=bordercolor; 
     title.style.filter="progid:DXImageTransform.Microsoft.Alpha(startX=20, startY=20, finishX=100, finishY=100,style=1,opacity=75,finishOpacity=100);"; 
     title.style.opacity="0.75"; 
     title.style.border="1px solid " + bordercolor; 
     title.style.height="18px"; 
     title.style.font="12px Verdana, Geneva, Arial, Helvetica, sans-serif"; 
     title.style.color="white"; 
     title.style.cursor="pointer"; 
     title.innerHTML="关闭"; 
     title.onclick=function(){ 
	 
          document.body.removeChild(bgObj); 
          document.getElementById("msgDiv").removeChild(title); 
          document.body.removeChild(msgObj); 
		  document.body.removeChild(msgf);
		  
     } 
	 
     document.body.appendChild(msgObj); 
	 document.body.appendChild(msgf); 
     document.getElementById("msgDiv").appendChild(title); 
     var txt=document.createElement("p"); 
     txt.style.margin="1em 0" 
     txt.setAttribute("id","msgTxt"); 
     txt.innerHTML=str; 
     document.getElementById("msgDiv").appendChild(txt); 
}